Hegel insists that knowledge is only knowledge if it can be communicated. The necessity of language rules out the idea of an entirely independent consciousness. Consciousness must interact with other consciousnesses if it is to develop into self-consciousness. In the end, mind can only find freedom and self-understanding in a rationally organized community. So minds are not separate atoms, linked together by the accidents of association. Individual minds exist together, or they do not exist at all.
P. Singer – A very short Introduction to Hegel